This is not the result of camera trickery, editing, or any other technological shenanigans — this is 100% human skill and talent (and, I'd guess, far more than 10,000 hours of practice). Smart of this dancer and whoever filmed it to have the glass door in the background so the reflections of passing cars can show that, realio-trulio, this is real-time.

As one of the commenters on the MetaFilter thread where I saw this said, "He pegs the uncanny valley with nothing more than movement." Another points out that at about 3:30, it looks like he gives up on the dance... but he doesn't.